Method for controlling the braking power in an electrohydraulic braking system of a motor vehicle

Abstract

A method for controlling the braking power in an electrohydraulic braking system of a transportation vehicle which includes initiating a braking process; detecting a current state of the electrohydraulic braking system; increasing the braking pressure based on the current state of the electrohydraulic braking system, wherein braking pressure is built up more rapidly by targeted, staggered supply of braking pressure to individual parts of the braking system.

The invention claimed is: 
     
       1. A method for controlling the braking force in an electrohydraulic brake system of a transportation vehicle, the method comprising:
 commencing a braking operation; 
 detecting a present state of the electrohydraulic brake system, wherein the detection of the present state detects a measured value measured by at least one sensor, wherein the measured value is indicative of the presence of gas bubbles in brake fluid in the brake system; 
 increasing a brake pressure based on the detected present state of the electrohydraulic brake system, 
 wherein the brake pressure increase is performed only after determination of deviation of the measured value from a reference value thereby indicating the presence of gas bubbles, and 
 wherein a resulting brake pressure build-up is performed by a targeted, temporally mutually separate supply of brake pressure to intact individual parts of the electrohydraulic brake system to facilitate the increase of the brake pressure without requiring pressure equalization flow between intact individual parts and non-intact parts of the electrohydraulic brake system. 
 
     
     
       2. The method of  claim 1 , wherein the commencement of the braking operation is initiated in response to the actuation of a brake pedal of the transportation vehicle. 
     
     
       3. The method of  claim 1 , wherein the detection of the present state of the electrohydraulic brake system is performed based on a present state of the brake fluid used in the brake system. 
     
     
       4. The method of  claim 1 , wherein the increase of the brake pressure based on the present state of the electrohydraulic brake system is performed by opening and closing of centrally controlled electric valves of the brake system. 
     
     
       5. The method of  claim 1 , wherein the targeted, temporally mutually separate supply of brake pressure to individual parts of the brake system is performed alternatively by alternating opening and closing of centrally controlled electric valves of the brake system to supply different parts of the brake system. 
     
     
       6. The method of  claim 1 , wherein brake pressure is supplied to a front axle and a rear axle of the transportation vehicle temporarily and mutually separately during the increase of the transportation vehicle brake pressure. 
     
     
       7. The method of  claim 1 , wherein, upon commencement of the method, brake pressure is supplied initially only to a rear axle, whereas a front axle remains separated from a braking fluid supply providing brake pressure thereto. 
     
     
       8. The method of  claim 1 , further comprising varying lengths of time intervals in which brake pressure is supplied to individual parts of the transportation vehicle brake system. 
     
     
       9. An electrohydraulic brake system comprising:
 an actuator for commencing a braking operation; 
 a detection unit for detecting a present state of the electrohydraulic brake system, wherein the detection of the present state detects a measured value measured by at least one sensor, wherein the measured value is indicative of the presence of gas bubbles in brake fluid in the brake system; 
 a closed-loop pressure control unit for increasing the brake pressure based on the present state of the electrohydraulic brake system, wherein the brake pressure increase is performed only after determination of deviation of the measured value from a reference value thereby indicating the presence of gas bubbles; and 
 a control unit for targeted distribution of the brake pressure, wherein the control unit is configured to control performance of a resulting brake pressure build-up by a targeted, temporally mutually separate supply of brake pressure to intact individual parts of the electrohydraulic brake system to facilitate the increase of the brake pressure without requiring pressure equalization flow between intact individual parts and non-intact parts of the electrohydraulic brake system. 
 
     
     
       10. The electrohydraulic brake system of  claim 9 , wherein the brake system comprises at least two mutually separately arranged detection units configured to detect the present state of the electrohydraulic brake system. 
     
     
       11. A transportation vehicle comprising the electrohydraulic brake system of  claim 9 . 
     
     
       12. The transportation vehicle of  claim 11 , wherein the brake system comprises at least two mutually separately arranged detection units configured to detect the present state of the electrohydraulic brake system. 
     
     
       13. The brake system of  claim 9 , wherein the commencement of the braking operation is initiated in response to the actuation of a brake pedal of the transportation vehicle. 
     
     
       14. The brake system of  claim 9 , wherein the detection of the present state of the electrohydraulic brake system is performed based on a present state of the brake fluid used in the brake system. 
     
     
       15. The brake system of  claim 9 , wherein the increase of the brake pressure based on the present state of the electrohydraulic brake system is performed by opening and closing of centrally controlled electric valves of the brake system. 
     
     
       16. The brake system of  claim 9 , wherein the targeted, temporally mutually separate supply of brake pressure to individual parts of the brake system is performed alternatively by alternating opening and closing of centrally controlled electric valves of the brake system to supply different parts of the brake system. 
     
     
       17. The brake system of  claim 9 , wherein brake pressure is supplied to a front axle and a rear axle of the transportation vehicle temporarily and mutually separately during the increase of the transportation vehicle brake pressure. 
     
     
       18. The brake system of  claim 9 , wherein, upon commencement of the method, brake pressure is supplied initially only to a rear axle, whereas a front axle remains separated from a braking fluid supply providing brake pressure thereto. 
     
     
       19. The method of  claim 9 , wherein lengths of time intervals in which brake pressure is supplied to individual parts of the brake system are varied.